After you install Microsoft Office 2003 Service Pack 3 (SP3), you cannot open
Microsoft Excel 5.0/95 Workbook files that contain Microsoft Visual Basic for Applications (VBA) macros in Microsoft Office Excel 2003
If the
macro security level is set to
High or to
Very
High, you may receive the following error message:
This workbook cannot be opened under High Security Level
because it contains a type of macro (Microsoft Excel 4.0 macro) that cannot be
disabled or signed.
If the macro security level is set to
Medium, you may unexpectedly be prompted to enable the macros or to disable
the macros.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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Microsoft has increased the level of security for VBA macros
in
Microsoft Excel 5.0/95 Workbook files in Office 2003 SP3.
This change provides more control for you to determine which macros will run. Additionally, this change helps prevent security attacks on earlier
file formats.
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